New command for pausing the runner

Relate to this proposal: #8139 we have started creating commands for the Runners accessing

Runners are one of the most critical components of GitLab, as they are responsible for executing CI/CD jobs across projects and organizations. Managing runners often requires timely operational actions—especially in cases such as maintenance, incident response, cost control, or workload management. Currently, pausing runners typically involves manual steps through the UI or API calls, which can be time-consuming and inefficient, particularly at scale.

Introducing the glab runner pause command significantly improves operational efficiency by:

• Reducing manual intervention and context switching
• Enabling faster response during incidents or maintenance windows
• Supporting automation and scripting for infrastructure workflows
• Improving overall DevOps productivity and runner governance

After merging !2856 (merged) we can start implementing this feature as well cc: @timofurrer